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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070108dfd6a9e59d00720d362885cc1f560cf3b8f7d0b99716b215ec99a070f5' 
  AND token = '4UcX1obr/maPms39oBPJhFFQ3X65og1JaMgf1A04VvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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