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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f7c34469b1ae4edea53fa72c38cd9904fff88fb3a957f3a8fcffeeeaaba7d8' 
  AND token = 'MJYpMBL4K6kqlDykSrpsrj5c9AMurrfSI66ytJrh57c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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