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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d672d0ac0c13ef6a8ae5168b9d04806ed89b6c6fcddaf3d648c864ee6405a9' 
  AND token = 'AY+AJSlWV80sgaagIjhxsak+ZQdGKV5TZbtb3vkFgiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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