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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2aa186c89f5ba3b473c5e1f0a93e5415c98e9e50dd548af488f14f02e3f2d8' 
  AND token = 'gWrt9+784Mbz+FVYC+Q7QuQy/ngEX5XBoHb1/hxtkZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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