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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7ff409b71bb06bc8898f0dcc2c4399a30dc3bcd7b9b44cf79817a3ac39a59d' 
  AND token = 'Dfpmd3iKnTtSFJfVFfilJYBDc5g6Td9dksOIkia7z9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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