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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ed44c44c35d9ce9692a0d73bd1207a55637f496077729c62f4db189f6555b6' 
  AND token = 'D1Q0tiYxcXCj5pwIWuy+TID4MIru0yv1T34X8f1wNpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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