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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6363683b7d61c2a4c139134523747afdcf9142977eb9527e68339cd5228ad54e' 
  AND token = 'NqB2FDHgBnb3od2lv6UPMnWINqpHsochZ9nojANNcsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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