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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce79b05bed63bcceade99f5919a205ce4c06c90becb3337ecdaa9aa4882b02c' 
  AND token = 'RO5VX/aiKag7IeprGaIcIACIEms4cwC/DeL0WoJh3iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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