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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba72b388a2526bd32ef01816f20d424af97468f069409251822f87b27248e02' 
  AND token = 'lRplD06zXjOh4c2uTMSwwHxkg6CxgdhkYMrWIyeWsyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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