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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cc6b52eb0235e71c3d6af73e4c27417e002e8374b41fc265b6598372fb3972' 
  AND token = 'OHxToZ9kA1eoaHJFb2wHvJuoyYzAF8SR6biNWcvIViA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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