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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232e5c42ffc7cee7a061f1d1a042a8e08c6b6d233cdb41a8e29661b184e71ff4' 
  AND token = 'BKbMzf8+nWFP/OgczJ+TkkSjgjk3z2UDsx/xqNarJr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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