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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127bff4ea2bc0d3e56020752465d8218c1538bc0415d008cd175e27b97baaf74' 
  AND token = '0NfY27lKOO5hC3kt3+0xYrSkyCtQx+KJtaNfhUPYeD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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