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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a189734a2e58dee99f2e0ee824906991403b120bcb545e673b6b30d2e585e74' 
  AND token = 'IOW9ErkfXfqfor85JtXqwccz8S3oXpn88nCTJk2flkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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