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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f009ecbc3f70739b478b9237ebb769288bf791b666c69c869f855bfc18d33f0' 
  AND token = 'YQ5W6/yHO8Td2iP5tbdsybJg/L7wpgNPT4rsQjXnf0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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