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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6583917d33325cbcc88dbf985596f8d7be8b2e832aedd459f66f080a985aa29f' 
  AND token = '+e+t7tyebm7i8UVtQHT09YZs5vw8t7dIPZLc9Lc9Rwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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