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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882c1e36dc20917520e2b01fe317a4f15f943cd82ee3e3524d726b4179592572' 
  AND token = '76uNGVpoWp0GOnqsR+lBGITiDbiwJwb4/uZsE0fOoWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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