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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3376b1eccb1eed1923ec46453639a2e7092dd577000c301158711af2912510' 
  AND token = 'K27dZPmg9JPGOSSWKl63hucDViDEjGlpNVGaNJP7bg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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