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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa70f5fe954bb635e4320441a44a3e11d9138e2fc83ba98004ebeb3db642a0b3' 
  AND token = 'C+9NYXGDvlgtheo4wWPedvTwh04jkevGHoWh4rK+JdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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