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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1817d14815023f09fab12903336acbe9c530e129a051b82641a76a6af0f5ec' 
  AND token = 'IdnM+3dt6px91icUBxTTPF2D+j41UI8rU6ShGvdxVl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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