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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f635b2b82ce662cf56134a62a7999c107b82a53ee12323852a5304395e4479' 
  AND token = '79vO2xF3P2PfxWHdojjiVPDffFzfopA2/nievIenSbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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