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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0bca8d53ad77711cac4f7473168b5da79bebd6c6c8f87f3fed084faf993b3a' 
  AND token = 'p2Mgv+kKq2m6flT5AoKdbCnTrURlK2wZRcVfb8gDv/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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