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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f87492b297d0211a19f079cfd36ec645d12a7c2b501b03b7214bf43cf434d1' 
  AND token = 'ZTamNO3iFF5YZtxZ2RCOzG9tPWu9Xx5suXKqruUr3JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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