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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9197c5370cc6bd5e4508aef6a2f27f39e0adda5993f412774e31652f2d02eb' 
  AND token = '93ugv+keHA11qI5lRTXD+PzqLjll/ZW17DFyWTfVEes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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