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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fdaeb9a17a44d02f5275091ee385c9d1ee223a9e2fdaf3a4bfff37418211d14' 
  AND token = 'wmkoZRqhklwzquhtChGLU/jslOZre3x8Z0cNnhUts1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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