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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051366dab3fdb577a0e311a5c83a9cc6b8e94e9990d5d618de7eaeefd3be950c' 
  AND token = 'w/Y359Lw9oMgGnx/MBNdWqnN7S9gyB2QLb7EHqgMbvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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