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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac40ba17a28fd7e1b3f173f42303163d9b18d11bfd078055a0737460bb28cb2' 
  AND token = 'MgP0HZ4gzPD+RK7/VpPtmB67WXM16S8kY26l5AJLAc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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