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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944ae6cfb6781609b7a0275bc6c6146849b211b142fcb48688a778ab5f8e4f66' 
  AND token = 'DUujFNtUSj2YGmCY6q2qvWXWBjRB0Li7orn52EWLJ30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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