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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc99e7aa78db426fece3df976c9cd0999faddabf24fcd1b7bf5c5cdb833b0e3e' 
  AND token = 'vK93sg6+CD3syiOm9C/W94YW9VFqUUl0MTLPyRxnhW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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