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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3054ea644078acdfcbc0fd7a3a19b21edc4e79e659b9d66e4c942936e7965c3c' 
  AND token = 'iXo9BSJokkHItKK6/XchJcnbAVBtjTZCi/pTlI4ae+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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