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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fd390afe08ef8bbfd30ec6962495cfb1ee49efb720952b8c1b397d2431f315' 
  AND token = '6I0IcBfF/WQEwSg+/x9YQmQPapY8bDAD5sMSpqsquIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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