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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a7059d3cbdf0a9c2e95a4f53cbba813fea15f8178d09b17a83b1f5c7441e8a' 
  AND token = 'HQ92ETcD3YhB/ZNUlUauL3JRuU8rdOYLS2KCGOiryIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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