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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f76ceff0f44c0e21c9365e93063c75e877711f6902e3dfaf6426b14ef07203' 
  AND token = 'opjTZNytBtmwaxBeglOzIKd6hgdbd6fwK4mU4/OJKT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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