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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1540ca0713f4784052b3e1dbb1ea2cd235cca218e4d522d12382f5cdbcf02d' 
  AND token = 'otEtmtcbLKZXvuXilwlR6KOHoxV6Q3/3a054/D7OyxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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