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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc84b900d920759c9ea2de88ab1bc1f5142ba8983adc19b4fa1275d3ddb3c193' 
  AND token = 'P7aUvvSnE6je/M7dYgwS9dv2QKmcomIXFTmxi5GTjDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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