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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae8dd1f7cff437477fd04dbb05a45c2caefb72812ded829f495e217e70ab595' 
  AND token = 'h9LatoMgP56tqy7HAB8sHEiq9gGGyeC2CC1t5gWXzlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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