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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d005d974ee6303e2d569b3ef0a69afe9d956286c5d3cf75f17779bb6e47702' 
  AND token = 'ssWp9sFC8V7l1CpNB8Va2B010+IWKylthQl2Ir0baC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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