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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4787eef7b42c3c838f7512a67cfff0b711f5b9a8ffb67c9f815a3833da95fd82' 
  AND token = '4cM2vMPZFLwBqk0Zp0KGMPcPuImZCA9tk3QddG5ML+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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