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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13bcf785b626a2e7c2747d383d3c651afe44e4104b6dbeb5c80b2901afd6bbe' 
  AND token = 'tYemUmRwh1PrSOeUa+cAyZOjIm8PcBon7IUCaXT993k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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