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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ac1ad4b173e408a11b5cddd1fb456c2707fa1c836bac00226c39942607b613' 
  AND token = 'TvsFrFDKjgpbsbBpH10VUKyjCuKO2tvm/Z47EDQiOZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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