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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebabb624140f9d7670cdc958d1c778ad95a976a9a2dfab6794a928ad6b8f0d7d' 
  AND token = 'F6lQiJjlktFX2exk7BUJBH89/K0WX0531CFdZ6irk5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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