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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac5776ed490e0ac8032e2c9fd8b424b0b68283f315863f2b758cbc8c9035f09' 
  AND token = '1YZHYBZQL1voZSLcd3qJRALvJWfaYYXJ2ByW9QFlbTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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