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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70d0ae3afccb716f1e941875343406006d099c908438a9e35ad0f54bd55362b' 
  AND token = '36ikijMSJzAVax9QCTsqMenqJ4s/AiTChVvMgrR05pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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