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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60ab8456b59dfa7d923d626e0a0984e148608444d9468b1fbd4512031e7d71b' 
  AND token = 'jY7G01qxI8yTt3VRcXRVeRDOYU6qyImczFymsq8Vmgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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