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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba5f5fe4e9af0f8716aae3bca26a87478e3be289572e0ef71336440fd7f5b3b' 
  AND token = 'V7E5bKWrsx5mx4Av9kp7Voz6WZiijsYinSNK0M984SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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