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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b62990d2ea2c30ed772b25b29fe2bf9f01d669213ebbf9657471df48815459a' 
  AND token = 'S5iZAo8fuN3s5bZC5q9UvkqF3Bo2/vBEDWMqnLvK90M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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