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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a9c830fc6f6784ca3a5be49771aa89354d79633396eaeeb3a657e9d47f0124' 
  AND token = 'a8p6GhlustfsYgtv3Ut4lsg7ZftD7U9VgliGSyzoQuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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