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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84a74aa4608e76fedbb1da5ad6bb9452b39699f90feb2673d9c15bf45462b23' 
  AND token = 'S+yWe3obFQuJdndVYXxja0nMQ8HGpOQqTJ+dLxbUrjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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