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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a109f22eda5d0fcf4f6d76c61733d49365bcc14c2e5e7d75dcdab8c4e475ed0b' 
  AND token = 'MLFsaFvtp65bR1GawjOluzk66+0ZX+bgjGe5QWLhONo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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