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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70d1c2735754d7f4844dea6fddd2b16ccb7130bb5e0fea4d978952fe33344e7' 
  AND token = '+yPR+QHpV1FyIUxirxVL4lgE/mFmkgjVQq6u9JTbEeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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