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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf379cf9219387908791cad2177280a3b3645f25faeb762eff5100823998d68' 
  AND token = '3j0M7WDTA4j1h/ehN8431uvjc6g4KGRF7Vt+vt+Lf4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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