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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3783fee9e814077c4ef420348517e6d35fca53850535fc26aac85a0eec31ae6a' 
  AND token = '38q2pg5KfrvFcekCSVDa5Cy3isYgLwb5QEzLgj7BPjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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