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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab9dc6e0d5a0c63501a63fb686542e3f78132fb9730816f98c29801551bbc6a' 
  AND token = 'iXGoHAMGtw8EUussdIaKCVNISrj6k/PL+JmXN70Yef4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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