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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b3137bf07c176855f36c56073231a4142f10d4155b64186165ebb77bf2ccd6' 
  AND token = 'JW5awspT4crAw9FgMx56S1A9viAMBJMibubPHpLOG+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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