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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da142c76673c988b0a11ff07a143ea668ea0ed457f3d78490a1f9f8d999ff879' 
  AND token = '5CXiaJxFhW+Mod+DIBBdzSfg7KljLabjt+0vw8IS24M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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