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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3976219bdd9c1088df65065419daf40e118f20d5f45df649d0fd844db41d92d' 
  AND token = 'GxwSe/1FFOF+bGChmFQHAb6Kx6hmwJRwxp+O6OeROqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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