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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713ef0d639fa34cb710fefdb38eff983912fb57d636d488b62c5390e8c243cd2' 
  AND token = 'UtbvHFE4g6GVaOlesAN178qLumHSpFZ2t2NDrCcYteA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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