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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5866137ecf7c5a7c9159685ae7094d5bb8f07e90c4de721f3116822a66fc3781' 
  AND token = 'ldkecwPNruppIJAeUfZJ14D9vhwv/GcRo1Y9Qk6qjxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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