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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba90984ba6ea9cb04c78798b5e82f27ada7d1f4136b324452aba63ff7f54f04' 
  AND token = 'LXPDpKezLT4XA6lFKvdDUTAaz50Jf4eGqQJqaSBC6fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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