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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9f2e909c94cdd00aa08135d4c2a7a8b9153e042b80ab8f0e649fe4afd3805f' 
  AND token = '6TK4bqB7CA/8bEJkup4t6wl11vylFaXrMY13edW3Jh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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