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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54364aa00fe35b8015c06f2e9a2e078e689e735f8b33a1c233ac16e97beb42a1' 
  AND token = '07UYxinR3xOTkhkxeHiGGOfOSgRPJCk1g3W/vQxI7Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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