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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7efced461bf7043209b3f5f5972939cf40e5f911ee6533092f82ce025589e5e9' 
  AND token = 'xEBBg9653OFqLfHG9KIzj+1yUm2tYB5i3g7/oQPuRsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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