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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88fc7eb67c0b97315e298aab67ae7ea9ce62c1d084a2b832e5c1ab4f78dbf107' 
  AND token = '7GgoA/WxHMcoImFb7JXyhBY3LK82Kl2xw5UsxpfVHaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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