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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b009f1722d57a4996bb2d43814d4302e027e6bb253675f19cee5a5e16307ba5' 
  AND token = '9I3KDjWcGHgtjXK6053DBQx5WyGdDV1MSef2Tgv1m7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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