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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa53e0b2245d7d5615f956ef5e57f7332e74924ff88146e46b1fb6103c68251a' 
  AND token = 'htew8Bf4eQqq/0HTw8A4CaALgZCLVZ8ZdX308D+KqlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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