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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f76d1ff2f30e284e03b22e5eb7ed00766a6e41d373e53e9a2b3e949a532cea2' 
  AND token = 'JTqPu2cHshym20LU2Q9SP2wNp8vkn3KV1bKDictx6io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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