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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2393f2d936dfbc1afdee47d892252ad8604f26e82157ebb873db4ec98d893df5' 
  AND token = 'HEHMJWwebjw53KAe2nr7A7D3W0iPfx2cvVhtx1hSun0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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