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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892ba810f8dfdea364da03e188595352e5346ed397f701f9543d07a467ef9fad' 
  AND token = 'PP0m7aAVcyEDe63muQV3B612lbZgsllLyCKo7B0+mbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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