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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0436cee55f74026f8107bfeeca68d9e6bc74b76d65b1e29debd78b3d552eb62' 
  AND token = 'V3gxDtwUNLUAc7JoLpRK/56OSsQqdYlU+jERNtZm+6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}