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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c149a78ee76ae531f4138be6e28f5ed07f5a230a0ea18ad1e9968d97d176a4' 
  AND token = '9U+aFfc+WA+sF7D3A9Dd8sqOW15dAz70pxmCKJJLRvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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