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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7df11a5150f59d3c2508f17913324bf78373757601ffdf70e14fd1db17ff5ec' 
  AND token = 'PB0TAOGmryA9OEFg8oneJDRCLLkQlde3NXL31Ulss3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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