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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e77e311424f6be1d75c9c93ccf9118adf940923d683c43a649310025bab749b' 
  AND token = 'EhP+Qtckd2BnkxokhTpM7lV0n4GC6Hgsj3THj/23F8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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